Potassium Carbonate → HCID 66682062, compound

HRID 909429Notes

Reaction equation

HRID 909429 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH:12]=[CH:11][CH:10]=[C:9]1B(O)O)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl[C:17]1[S:18][C:19]2[CH:25]=[CH:24][CH:23]=[CH:22][C:20]=2[N:21]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(=O)([O-])[O-].[K+].[K+]>COCCOC.C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C(OCC)(=O)C.O>[S:18]1[C:19]2[CH:25]=[CH:24][CH:23]=[CH:22][C:20]=2[N:21]=[C:17]1[C:9]1[N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[CH:12]=[CH:11][CH:10]=1

Participants

9

Reactant 4

HCID 11430Potassium CarbonateHCID 11776TriphenylphosphineHCID 119872-ChlorobenzothiazoleHCID 27343211-(tert-Butoxycarbonyl)-2-pyrroleboronic Acid

Product 1

HCID 66682062HCID 66682062, compoundYield 82.4%

Reagents, catalysts & solvents 4

HCID 167845palladium(II) acetateCatalystHCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
100 °C

Procedure

Commercially available 1-(t-butoxycarbonyl)pyrrole-2-boronic acid (417 mg, 1.98 mmol) was dissolved in 1,2-dimethoxyethane (20 mL), and 2-chloro-1,3-benzothiazole (0.25 mL, 2.02 mmol), palladium (II) acetate (23.0 mg, 0.102 mmol), triphenylphosphine (105 mg, 0.400 mmol) and an aqueous potassium carbonate solution (3M, 1.3 mL, 0.433 mmol) were added, followed by stirring at 100° C. for 22 hours under nitrogen atmosphere. The reaction solution was cooled to room temperature, water (20 mL) and ethyl acetate (20 mL) were added, and the solution was separated. The organic layer was washed with saturated brine, and subsequently dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified using silica gel column chromatography (elution solvent: ethyl acetate/hexane=0%-20%) to afford the desired compound (490 mg, yield 82%) as a pale yellow oil.

Workup

  1. temperatureThe reaction solution was cooled to room temperature
  2. customthe solution was separated
  3. washThe organic layer was washed with saturated brine
  4. dry with materialsubsequently dried over anhydrous magnesium sulfate
  5. distillationThe solvent was distilled off under reduced pressure
  6. customthe resulting residue was purified
  7. washsilica gel column chromatography (elution solvent: ethyl acetate/hexane=0%-20%)

Sources & evidence

ORD record
ord-fdc8dee2fed04419bd154b4c232537fd
Source dataset
uspto-grants-2011_09
Patent number
US08017610B2

Reaction notes

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